This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Project Survey – Tunnelling”.
1. Tunneling is required in case of ____________
a) Laying pavement
b) Laying road
c) On ground passage
d) Underground passage
View Answer
Explanation: Tunnel can be defined as artificial underground passage, which is created for different purposes. It is required in case of highways, railways, sewerage and water supply.
2. The line at which the tunnel wall breaks from sloping outward can be given as _________
a) Spring line
b) Oval line
c) Centre line
d) Middle line
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Explanation: Spring line is determined as the line at which the wall breaks from sloping outward to sloping inward toward the crown. This acts as a barrier between the outward and inward regions.
3. Which of the following should be considered while aligning a tunnel?
a) Atmospheric conditions
b) Hydrological conditions
c) Climatic conditions
d) Surface limits
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Explanation: The determination of the alignment for tunnel can be done based on geological and hydrological conditions, cross-section and length of the continuous tunnel, time of consideration and limit of the surface.
4. Among the following, which doesn’t belong to tunnel classification?
a) Firm ground
b) Running ground
c) Rocky ground
d) Soft ground
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Explanation: Tunneling has been classified based on the type of strata present. It includes firm ground, soft ground and running ground. These will determine the bearing capacity of the soil.
5. Which method can be adopted if full face excavation is not possible?
a) Back bearing method
b) Plotting
c) Trenching
d) Benching
View Answer
Explanation: In case of no possibility of full face excavation, top heading method is adopted for having a better output. Benching process is also adopted for digging small tunnels.
6. Among the following, which can be adopted for providing support for soft strata?
a) Bents of aluminum
b) Bents of iridium
c) Bents of steel
d) Bents of plastic
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Explanation: The provision of soft strata must be done for withstanding the excavation. It can be provided by bents of wood, bents of steel, liner plates and poling, which are placed to retain material between the adjacent bents.
7. A steel cylinder which is pushed in the soft soil is determined as ________
a) Jar born
b) Shield
c) Rod
d) Pole
View Answer
Explanation: In the case of soft grounds, tunneling can be dangerous and cave-ins are common. To prevent this, an iron or steel cylindrical element called shield is placed in the soft soil, which can crave the hole perfectly.
8. Which method can be adopted in case of rock tunneling?
a) Full face method
b) Benching
c) Tracing
d) Back bearing method
View Answer
Explanation: Rock tunneling involves the same principle as of the tunneling in the ground. Those include full face method, top heading method and drift method. Based on the conditions of the area, these can be adopted.
9. Which of the following can act as an alternative for blasting?
a) Tunneling
b) Continuous blasting
c) Sequential blasting
d) Fire-setting
View Answer
Explanation: Blasting is the conventional method which is adopted in case of rock tunneling. In the case of fire-setting, tunnel is heated with fire and then cooled with water. Rapid expansion and contraction weakens and rock and tends to break.
10. Which of the following involves in the sequence of rocky strata?
a) Marking profile
b) Placing rocks
c) Improving foul gases
d) Recording values
View Answer
Explanation: Rocky strata involve usage of blasting method for developing tunnels. The sequence contains marking profile, loading explosive, removing foul gases, checking, scaling, mucking and bolting.
Sanfoundry Global Education & Learning Series – Surveying.
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